Knife bar



J. E. ECKERSLEY Feb. 5, 1929.

KNIFE BAR Filed Aug. 19. 1927 5 Sheets-Sheet Grtoznev Feb. 5, 1929. v

J. E. ECKERSLEY KNIFE BAR Filed Aug. 19, 1927 5 Sheets-Sheet 2 ANN,

Feb. 5, 1929. 1,700,788

,1. E. ECYKERSLEY KNIFE BAR Filed Aug.19. 1927 :5 sheets-sheet s Patented Feb. 5, 1929. v

' UNITED.- 'Ares ENTI oFfFIcE. l l

JAMES E. ECKERSLEY, vOIE ABERDEEN, WASHINGTON,VASSIGNOR V0]!" ONE-.HALF T0 ALEXANDER POLSON, `O15' ,HOQUIAIVL WASHINGTQN.- Y

,KNIFE BAB.

The object of my invention is to provide a knife bar, and its mounting, for wood slicing machines (shingle, shooks and veneer) which will Inakethe desired cuts with a minimum of power and without liability of dragging undercut lfibers through the timber thereby eliminating the possibility ofl breaking the grain and the other fibers ahead of it and shattering the stock; and witli these and other objects in View my invention consists of the parts and combination of parts as will be hereinafter morefully set forth.

In the drawings:

Figurel is a front elevation of the knife bar andits mounting. n

Figure 2 is a top planview of the same.

Figure 3 is a section on the line 3 3, Figp ure 1, looking in the direction of the arrows. Figure 4 is a sectional view on the line4--4, Figure 3, looking in the direction of the arrow. l

Figure 5 is a section on the line `5 5, Figure 4 looking in 'the direction of the arrows. n Figure 6-is a'front elevation ofanotherembodiment of my invention.

Figure 7 is a top plan view ofFigure 6. Figure 8 is a sectional view through one of the end bearings of the knife frame of Figure 6. The reference numeral 9 designates suitable power shafts connected with a source of power not shown. To this shaft is keyed an angle crank 10.. At the outer end of the crank levers there is pivoted the links 11 and 12. A bearing 18 is provided with a lug 14 to which the end of the links 11 and 12 are pivoted as clearly shown in Figure 1. This bearing member 18 is provided with a side wall 15 integrally formed therewith and with a removable side wall 16 detachably connected thereto, thereby forming between these two walls a guideway in which the guide bar 17 is mounted. Suitable antifriction rollers 18 are mounted in housings 181 formed .on the ends of the knife bar 182 as clearly shown in Figure 4. These antifriction rollers sustain the weight of the knife bar 182 on the guide bar 17 and carry the weight of the knife bar in a balanced position. 16 are side members fastened on the opposite side of the bearing member 13 to hold the side sway of the knife bar 182. The knife bar 182 is provided with a series lof ribs 19 extending from end' to end of the bar and in substantial parallelism with each* other, which ribs function asbeams to rigidifyand strengthen the knife bar 182. To further rigidify and to strengthen the knifejbfar 18'2 I provide ribs 20 extending transversely of the bar and between the beams 19, these ribs extending down to the lip 21 of the bar. 22 are the knife blades secured to the bar-by suitable means such as the screws 28. 'lVhile this knife may be in one piece, at the Sametime-I prefer to use three separate blades, as shown e and are placed end to end andwillfcoast down the bars 17ftlrrough apiece of timber 12"inches wide by-9 feet long, and' by the elimination of a pressure bar, all the power that is needed is the raising of the bar, whereas in all other machines cutting 62 to 100 incheswould require from 50 to 7 0 II. P. to do the same work.

In my machine, by reason of the knifebar organization shown, the knife can be operated to cut a piece of timber 12 inches wide with a power of 6l/2 H. P. From this it is very easy to draw a comparison as to the tremendous strain that the old machines exert on the timber to ydo their cutting, andfrom 1 this it can be readily understood why these older machines crush the grain. In all machines that I am awa-re of doing this kind of work the knives do not cuty through all of the fiber because of the lack of shear and thisiiber gat-hers over the edge of the knife and is thenpushed through the timber breaking the grain and the other fibers ahead of it, andas a consequence the stock that comes out is very pliable and shattered.

The extreme low degree on which my improved knife bar organization operates enables me to build a machine much shorter and 1 at less cost to do away with the pressure bar usually heretofore employed to Atake care of my machine which weighs only about 9 tonsA while the knife bar weighs 1900 pounds, lwith a speed of 40 strokes per minute as compared with the 30 strokesper minute of the older` machines now on the market, andrthis is all due to the knife bar organization shown and described herein. n

From the above it will be seen that the angle of cutting,` is a very important consideration, and I have been able to utilize the desired angle of cutting` without increasing the size of the machine, or the cost of themachine, and at the-same time am enabled to run the machine at a materially less I-I. P.

In the machines in commercial use my knife is set at an angle of 3Go, which is more than any other machine on the market that I know of; but, of course, it will be understood that I do not limit myself to this angle, whether the knives are cuttingon t-he bottom of the block or on the side of the block.

Changes may be madein the detail of construction without departing from the spirit of my invention, or the scope of the appended claims. Y f

Vhat I claim is: f

l. A knife bar .comprising a main body adapted to Vreceive knife blades, and obliquely disposed slide bearings integral with each end of the bar, said bearings being` disposed on the same angle and in parallel planes.

k2. A knife bar comprising a. mainv body, obliquely disposed slide bearings integral with each end of the bar, said bearings being disposed onrthe same angle and in parallel planes, and guide bars mounted in said bearings 3. A knife bar comprising a main trussed body adapted toreceive knife blades, and obliquely disposed slide bearings integral with each end of the bar, said bearings being disposed on the same angle and in parallel planes. y l

4L. In av wood cutting machine, a knife bar comprising a main body, knives secured to said body, obliquely disposed slide bearings integral with each end of the bar `disposed on the same angle and in parallel planes, guide bars mounted in said bea-rings, and means to operate the bar.

5. In a knife bar, a main body, an obliquely i disposed anti-friction bearing; integral with each end of the body both disposed in the same direction and in parallel planes and a guide bar mounted in each of said bearings.

6. A knife bar comprising a main body, a slide way bearing integral with each end of the body land open at one side, and obliquely dispos-ed in the same angle and in parallel planes, bearings lat each end of said ways, a removable side plate closing the open side of said ways back of said plate, a guide bar mounted ineach of said ,ways and means to connect said bar to a source of power. v

In testimony whereof I afX my si'gnature.

JAMES E. EGKERSLEY. 

